Marwyn, the Nurturer, Kogla, the Titan Ape, Eternal Witness, and Vitalize

Prerequisites

• Marwyn, the Nurturer on the battlefield
• Kogla, the Titan Ape on the battlefield
• Eternal Witness on the battlefield
• Vitalize in hand
• Marwyn does not have summoning sickness and has a power of eight or greater

Steps

1. Activate Marwyn by tapping it, adding at least eight
2. Cast Vitalize by paying , untapping all creatures you control
3. Activate Kogla by paying , returning Eternal Witness from the battlefield to your hand
4. Cast Eternal Witness by paying
5. When Eternal Witness enters the battlefield, it triggers, returning Vitalize from your graveyard to your hand
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of creatures you control